1 pound pappardelle or fettuccine pasta
5 tablespoons unsalted butter
1½ cups heavy cream
2 cups freshly grated Parmesan, plus more for serving
Salt and freshly cracked black pepper
Pinch of freshly grated nutmeg
Bring a large pot of water to a boil. Add salt and cook pasta according to package directions, until al dente. When draining, reserve 1 cup pasta water.
Meanwhile, in wide-bottom saucepan, or large heavy-bottomed skillet over medium heat, add butter. Stir until melted and add heavy cream. Let butter and cream simmer, stirring occasionally, until slightly thickened (should coat the back of a spoon and leave a line when you drag your finger across the spoon).
Slowly add grated Parmesan, stirring until desired consistency is reached. Bring back to a boil, stirring constantly, until cheese is fully incorporated into the sauce. Stir in pepper, nutmeg, and careful salt to taste, as Parmesan is quite salty.
Add noodles over heat. Add reserved pasta water to thin a bit. Toss to coat pasta completely. Top with extra Parmesan and pepper, if desired, and serve immediately.